Today is Mother's day so I didn't do much in the garage. I did finish up the last couple tasks for section 16.
I riveted the outboard aileron bracket which ties in the end rib to the subpar.
Then I did the counter sinks for the nut plates at the inboard end of the top wing skins. These are large countersinks to fit a skin dimpled for a #8 screw. The #8 countersink would not go in far enough- the pilot pin gets stopped by the nut plates since they taper and the pilot doesn't. I cleared out all the holes with the #8 as deep as it would go and then carefully finished with the #30 countersink to full depth.